Openidc Liboauth2 vulnerabilities

2 vulnerabilities

Known vulnerabilities in Openidc Liboauth2, newest first, with CVSS severity, EPSS, KEV listings, ransomware use and the affected versions.

5.1CVE-2026-54431debianliboauth2+2
EPSS score
0.18%
In liboauth2 the Demonstrating Proof-of-Possession (DPoP) verifier accepts a proof whose JSON Web Key (jwk) header contains private key material. RFC 9449 section 4.3 step 7 requires the verifier to reject such a proof but oauth2_token_verify() function returns success for a malformed DPoP proof that embeds the private Elliptic Curve (EC) key in the header. This issue was fixed in version 2.3.05.1CVE-2026-54430debianliboauth2+2
EPSS score
0.17%
liboauth2 is vulnerable to Server-Side Request Forgery in oauth2_jose_jwks_aws_alb_resolve() function. The AWS ALB verifier reads both signer and kid from the unverified JWT header. If signer matches the configured ARN, kid is appended to alb_base_url without URL encoding or path sanitization, and the HTTP GET is issued before signature verification. This allows an attacker to force the server to send a GET request to an attacker-chosen internal path. This issue was fixed in version 2.3.0